<?php
/**
 * ZIP压缩和解压缩类
 *
 * @author Mo yi <root@imoi.cn>
 * @link   http://www.imoi.cn
 * @copyright Copyright &copy; 2010-2012 DuoLam Software LLC
 * @license http://www.imoi.cn/license/
 * @version $Id: dpZip.php 1 2012-04-04 13:35:54Z Mo.yi $
 * @package web.helper
 * @since 1.0
 */

class dpZip
{
    protected $datasec = array();
    protected $ctrl_dir = array();
    protected $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
    protected $old_offset = 0;
    
    protected $total_files = 0;
    protected  $total_folders = 0; 
    
    public function compress($zip_filename, $dir='./', $path_replace='')
     {
        if (function_exists('gzcompress')) { 
            $filelist = $this->GetFileList($dir);

            if (count($filelist)>0) {

                foreach($filelist as $filename) {
                    if (is_file($filename) && stripos($filename, 'dpZip') === false) {
                        $fd = fopen ($filename, "r");
                        $content = @fread($fd, filesize ($filename));
                        fclose ($fd);
                        $this->addFile($content, str_replace($path_replace, '',$filename));
                    }
                }

                $out = $this->file();
                $fp = fopen($zip_filename, "w");
                fwrite($fp, $out, strlen($out));
                fclose($fp);
                return true;
            }
        } 

        return false;
    }


     public function decompress($zip_filename, $dir='./')
     {
            $index = array(-1);
            $ok = 0;
            $zip_fp = @fopen($zip_filename,'rb');

            if (!$zip_fp)
                return false;
                
            $cdir = $this->ReadCentralDir($zip_fp,$zip_filename);

            $pos_entry = $cdir['offset'];
            
            if (!is_array($index)) { 
                $index = array($index); 
            }

            // for ($i=0; $index[$i];$i++) {
            //     if (intval($index[$i])!=$index[$i]||$index[$i]>$cdir['entries'])
            //     return false;
            // }

            for ($i=0; $i<$cdir['entries']; $i++) {
                 @fseek($zip_fp, $pos_entry);
                 $header = $this->ReadCentralFileHeaders($zip_fp);
                 $header['index'] = $i;
                 $pos_entry = ftell($zip_fp);
                 @rewind($zip_fp); 
                 fseek($zip_fp, $header['offset']);
                 if (in_array("-1",$index)||in_array($i,$index))
                    $stat[$header['filename']]=$this->ExtractFile($header, $dir, $zip_fp);
            }

            fclose($zip_fp);
            return $stat;
     }
    private function GetFileList($dir) 
    {
        $file=array();

        if (file_exists($dir)) {
        
            if( substr( $dir, -1 ) != "/" ) {
                $dir .= "/";
            }

            
            $dh = opendir($dir);

            while ($files = readdir($dh)) {
                if (($files!=".")&&($files!="..")) {
                    if (is_dir($dir.$files)) {
                        $file = array_merge($file, $this -> GetFileList( $dir.$files ));
                    }
                    else $file[]= $dir.$files;
                }
            }

            closedir($dh);
        }

        $file[] = '';
        return $file;
    }

    private function unix2DosTime($unixtime = 0)
    {
        $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime); 
        if ($timearray['year'] < 1980) {
            $timearray['year'] = 1980;
            $timearray['mon'] = 1;
            $timearray['mday'] = 1;
            $timearray['hours'] = 0;
            $timearray['minutes'] = 0;
            $timearray['seconds'] = 0;
        } 
        return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
    ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
    } 

    private function addFile($data, $name, $time = 0)
    {
        $name = str_replace('\\', '/', $name); 
        $dtime = dechex($this->unix2DosTime($time));
        $hexdtime = '\x' . $dtime[6] . $dtime[7]
        . '\x' . $dtime[4] . $dtime[5]
        . '\x' . $dtime[2] . $dtime[3]
        . '\x' . $dtime[0] . $dtime[1];
        eval('$hexdtime = "' . $hexdtime . '";');
        
        $fr = "\x50\x4b\x03\x04";
        $fr .= "\x14\x00"; // ver needed to extract
        $fr .= "\x00\x00"; // gen purpose bit flag
        $fr .= "\x08\x00"; // compression method
        $fr .= $hexdtime; // last mod time and date
        
        // "local file header" segment
        $unc_len = strlen($data);
        $crc = crc32($data);
        $zdata = gzcompress($data);
        $c_len = strlen($zdata);
        $zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
        $fr .= pack('V', $crc); // crc32
        $fr .= pack('V', $c_len); // compressed filesize
        $fr .= pack('V', $unc_len); // uncompressed filesize
        $fr .= pack('v', strlen($name)); // length of filename
        $fr .= pack('v', 0); // extra field length
        $fr .= $name;
        
        // "file data" segment
        $fr .= $zdata;
        
        // "data descriptor" segment (optional but necessary if archive is not
        // served as file)
        $fr .= pack('V', $crc); // crc32
        $fr .= pack('V', $c_len); // compressed filesize
        $fr .= pack('V', $unc_len); // uncompressed filesize
        
        // add this entry to array
        $this -> datasec[] = $fr;
        $new_offset = strlen(implode('', $this->datasec));
        
        // now add to central directory record
        $cdrec = "\x50\x4b\x01\x02";
        $cdrec .= "\x00\x00"; // version made by
        $cdrec .= "\x14\x00"; // version needed to extract
        $cdrec .= "\x00\x00"; // gen purpose bit flag
        $cdrec .= "\x08\x00"; // compression method
        $cdrec .= $hexdtime; // last mod time & date
        $cdrec .= pack('V', $crc); // crc32
        $cdrec .= pack('V', $c_len); // compressed filesize
        $cdrec .= pack('V', $unc_len); // uncompressed filesize
        $cdrec .= pack('v', strlen($name) ); // length of filename
        $cdrec .= pack('v', 0 ); // extra field length
        $cdrec .= pack('v', 0 ); // file comment length
        $cdrec .= pack('v', 0 ); // disk number start
        $cdrec .= pack('v', 0 ); // internal file attributes
        $cdrec .= pack('V', 32 ); // external file attributes - 'archive' bit set
        
        $cdrec .= pack('V', $this -> old_offset ); // relative offset of local header
        $this->old_offset = $new_offset;
        
        $cdrec .= $name;
    
        $this->ctrl_dir[] = $cdrec;
    } 

    private function file()
    {
        $data = implode('', $this -> datasec);
        $ctrldir = implode('', $this -> ctrl_dir);
        
        return
        $data .
        $ctrldir .
        $this -> eof_ctrl_dir .
        pack('v', sizeof($this -> ctrl_dir)) . 
        pack('v', sizeof($this -> ctrl_dir)) . 
        pack('V', strlen($ctrldir)) .
        pack('V', strlen($data)) . 
        "\x00\x00"; 
    } 

    

    protected   function ReadFileHeader($zip)
    {
        $binary_data = fread($zip, 30);
        $data = unpack('vchk/vid/vversion/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len', $binary_data);

        $header['filename'] = fread($zip, $data['filename_len']);
        if ($data['extra_len'] != 0) {
            $header['extra'] = fread($zip, $data['extra_len']);
        } else { 
            $header['extra'] = ''; 
        }

        $header['compression'] = $data['compression'];$header['size'] = $data['size'];
        $header['compressed_size'] = $data['compressed_size'];
        $header['crc'] = $data['crc']; $header['flag'] = $data['flag'];
        $header['mdate'] = $data['mdate'];$header['mtime'] = $data['mtime'];

        if ($header['mdate'] && $header['mtime']) {
            $hour=($header['mtime']&0xF800)>>11;$minute=($header['mtime']&0x07E0)>>5;
            $seconde=($header['mtime']&0x001F)*2;$year=(($header['mdate']&0xFE00)>>9)+1980;
            $month=($header['mdate']&0x01E0)>>5;$day=$header['mdate']&0x001F;
            $header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
        } else {
            $header['mtime'] = time();
        }

        $header['stored_filename'] = $header['filename'];
        $header['status'] = "ok";
        return $header;
    }

    protected  function ReadCentralFileHeaders($zip)
    {
        $binary_data = fread($zip, 46);
        $header = unpack('vchkid/vid/vversion/vversion_extracted/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len/vcomment_len/vdisk/vinternal/Vexternal/Voffset', $binary_data);

        if ($header['filename_len'] != 0)
            $header['filename'] = fread($zip,$header['filename_len']);
        else
            $header['filename'] = '';

        if ($header['extra_len'] != 0)
            $header['extra'] = fread($zip, $header['extra_len']);
        else
            $header['extra'] = '';

        if ($header['comment_len'] != 0)
            $header['comment'] = fread($zip, $header['comment_len']);
        else
            $header['comment'] = '';

        if ($header['mdate'] && $header['mtime']) {
            $hour = ($header['mtime'] & 0xF800) >> 11;
            $minute = ($header['mtime'] & 0x07E0) >> 5;
            $seconde = ($header['mtime'] & 0x001F)*2;
            $year = (($header['mdate'] & 0xFE00) >> 9) + 1980;
            $month = ($header['mdate'] & 0x01E0) >> 5;
            $day = $header['mdate'] & 0x001F;
            $header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
        } else {
            $header['mtime'] = time();
        }
        $header['stored_filename'] = $header['filename'];
        $header['status'] = 'ok';

        if (substr($header['filename'], -1) == '/')
            $header['external'] = 0x41FF0010;

        return $header;
    }

    protected function ReadCentralDir($zip,$zip_name)
    {
        $size = filesize($zip_name);

        if ($size < 277)
            $maximum_size = $size;
        else
            $maximum_size=277;

        @fseek($zip, $size-$maximum_size);
        $pos = ftell($zip); $bytes = 0x00000000;

        while ($pos < $size) {
            $byte = @fread($zip, 1); $bytes=($bytes << 8) | ord($byte);
            if ($bytes == 0x504b0506 or $bytes == 0x2e706870504b0506){ $pos++;break;} $pos++;
        }

        $fdata=fread($zip,18);

        $data=@unpack('vdisk/vdisk_start/vdisk_entries/ventries/Vsize/Voffset/vcomment_size',$fdata);

        if ($data['comment_size'] != 0) $centd['comment'] = fread($zip, $data['comment_size']);
        else $centd['comment'] = ''; $centd['entries'] = $data['entries'];

        $centd['disk_entries'] = $data['disk_entries'];
        $centd['offset'] = $data['offset'];$centd['disk_start'] = $data['disk_start'];
        $centd['size'] = $data['size'];  $centd['disk'] = $data['disk'];
        return $centd;
    }

    protected function ExtractFile($header,$to,$zip)
    {
        // $header = $this->readfileheader($zip);
        if (substr($to,-1)!="/") $to.="/";
        if ($to=='./') $to = ''; 

        $pth = explode("/",$to.$header['filename']);
        $mydir = '';

        for ($i=0;$i<count($pth)-1;$i++) {

            if (!$pth[$i]) continue;
            $mydir .= $pth[$i]."/";

            if ((!is_dir($mydir) && @mkdir($mydir,0777)) || (($mydir==$to.$header['filename'] || ($mydir==$to && $this->total_folders==0)) && is_dir($mydir)) ){
                @chmod($mydir,0777);
                $this->total_folders ++;
            }
        }
        
        if (strrchr($header['filename'],'/')=='/') return;   

        if (!($header['external']==0x41FF0010)&&!($header['external']==16)) {

            if ($header['compression']==0) {
                $fp = @fopen($to.$header['filename'], 'wb');

                if (!$fp) return(-1);

                $size = $header['compressed_size'];
            
                while ($size != 0) {
                    $read_size = ($size < 2048 ? $size : 2048);
                    $buffer = fread($zip, $read_size);
                    $binary_data = pack('a'.$read_size, $buffer);
                    @fwrite($fp, $binary_data, $read_size);
                    $size -= $read_size;
                }
                fclose($fp);
                touch($to.$header['filename'], $header['mtime']);
            } else {
                $fp = @fopen($to.$header['filename'].'.gz','wb');
                if (!$fp) return(-1);
                $binary_data = pack('va1a1Va1a1', 0x8b1f, Chr($header['compression']),
                Chr(0x00), time(), Chr(0x00), Chr(3));
                
                fwrite($fp, $binary_data, 10);
                $size = $header['compressed_size'];
            
                while ($size != 0) {
                    $read_size = ($size < 1024 ? $size : 1024);
                    $buffer = fread($zip, $read_size);
                    $binary_data = pack('a'.$read_size, $buffer);
                    @fwrite($fp, $binary_data, $read_size);
                    $size -= $read_size;
                }
            
                $binary_data = pack('VV', $header['crc'], $header['size']);
                fwrite($fp, $binary_data,8); fclose($fp);
        
                $gzp = @gzopen($to.$header['filename'].'.gz','rb') or die("Cette archive est compressé–‘");
                if (!$gzp) return(-2);
                $fp = @fopen($to.$header['filename'],'wb');
                if (!$fp) return(-1);
                $size = $header['size'];
            
                while ($size != 0) {
                    $read_size = ($size < 2048 ? $size : 2048);
                    $buffer = gzread($gzp, $read_size);
                    $binary_data = pack('a'.$read_size, $buffer);
                    @fwrite($fp, $binary_data, $read_size);
                    $size -= $read_size;
                }
                fclose($fp); gzclose($gzp);
            
                touch($to.$header['filename'], $header['mtime']);
                @unlink($to.$header['filename'].'.gz');
                
            }
        }
        
        $this->total_files ++;
        return true;
    }
}
?>